Shoppers are voicing their frustration after an update resulted in products showing incorrect sizing.
This online marketplace has revised its measurement guidelines for women's and children's clothes failing to inform every member regarding the update.
Numerous buyers and vendors have taken to social media saying Vinted listings now show an altered size classification than originally posted due to the recalibration.
Vinted explained the new system was more in line with comparable marketplaces.
It has advised users to check their listings and manually change the size if necessary, causing user dissatisfaction.
Before the change, the sizing featured one number and one letter, like S/8 or M/10.
The new system has an alphabetical indicator and numerical range for example S/UK 8-10.
In some cases, the size labels have been reassigned - like an L measurement used to be a 12 but is now a UK 16-18.
A fashion influencer, who makes TikTok content about plus-size fashion, stated the update "complicates both purchasing and selling".
"Few clothing companies classify XL as 20-22," which is what Vinted now does.
Stephanie Gallen, based in Glasgow, stated items she posted on Vinted with size 14 labels were displaying on the service as measurements 20-22.
"Should someone sized 20-22 purchase these they're going to be very disappointed," she said.
Another shopper, from Derby, stated she felt frustrated due to the update requiring manual adjustment the sizes on "every single listing".
"For me this is particularly frustrating, since I have chronic health issues and selling on Vinted has been paramount for me since losing part of my income," she said.
The platform boasts over 100 million users, comprising 18 million UK members.
It has proved a popular alternative compared to resale services such as eBay and Depop.
This represents another occasion where an unanticipated change to the app has proved unpopular: earlier, the platform withdrew an update regarding delivery choices after backlash from users.
A tech journalist with over a decade of experience covering digital innovations and consumer electronics.
